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Home >> Hummer >> 2008 >> H3 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 109 (Mirror Systems) >> Diagnostic Information and Procedures >> Power Mirrors Inoperative >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the power mirror switch of the outside rearview mirror.
  2. Ignition ON, verify that a test lamp illuminates between the voltage supply circuit and ground.
    • If the test lamp does not illuminate, repair the voltage supply circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  4. Test for 25-95 ohms of resistance between the control terminal and the ground terminal of each motor control circuit.
    • If the resistance is not within the specified range, test the circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the outside rearview mirror.
  5. If all circuits test normal, replace the power mirror switch.
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